silly kids stackings for cement!

ron, just got back from vegas, which was a learning experience but also a lot of time away from my studies. but as i was trying to go to sleep i kept thinking about the cement project, well i have been think'n about it for a few days now. my initail idea was for 'square' pieces of concrete connected through the center with rebar, but connected in a way that the pieces could move. then i started thinking if the pieces were light enough then they could not only be moved but also remove. so i guess i was visioning a infastructure of rebar were pieces could be taken out, kind of like opening a window or the blinds in the morning, but then the pieces that are removed could act as something else. so a interactive/reactive system. but then i wondered if that might be too much work for someone to want to do. so i thought the cement pieces could be bricks. but not exactly like center blocks were pieces are taken out to allow for rebar, these would resemble more of a 'lego' style, allowing for several different types of pieces all with the extruded male connection pieces in the middle of each piece. this would allow for a system of constuction that anyone could do, and with several types of pieces: typical brick, 45's, 90's ect. any shape could be made. but these are just some thoughts for a new component of a building system.